frikart



A TTORNEYJ'.

(No Model.)

J., R. FRIKART.

VALVE GEAR.

No. 482,007. Patented Sept. 6, 1892.

NITED STATES PATENT Fi m.

.TOHANN R. FRIKART, OF MUNICH, GERMANY.

VALVE-G EAR.

SPECIFICATION forming part of Letters Patent No. 482,007, datedSeptember 6, 1892.

Application filed March 8, 1891. Serial No. 383,649. (No model.)Patented in France July 20, 1883, No. 156,647, and July 20,

1887, No. 184.903 in Belgium September 17. 1884,110. 66,332, andNovember 3, 1887, No. 79,398; in Germany September 26, 1884,].1'0.31,24Z,and May 16, 1888, No. 47,851; in England April 2'7, 1887, No.6,151, andMay 3,1889,N0. 7,377; in Austria-Hungary August 22,1887,No.13,114 and No. 36,366, and February 28, 1888, No. 36,582 and No.3,851,- in Italy August 28, 1888, N0. 443: in Switzerland 8eptemher 20,1889.110. 1.505, and in Spain August 7, 1890, No- 10,901.

To all whom it may concern.-

'Be it known that I, J OHANN R. FRIKART, a

resident of Munich, Bavaria, Germany, have invented certain new anduseful Improvements in Distributing Valve-Gear Mechanism forExpansion-Engines, (for which I have obtained Letters Patent inFrance,No. 156,647, dated July 20, 1883, and No. 184,903, dated July 20,1887; in Belgium, No. 66,332, dated September 17, 1884, and No. 79,398,dated November 3,1887; in Germany, No. 31,242, dated September 26, 1884,and No. 47,351, dated May 16, 1888; in Austria-Hungary, No. 13,114 andNo. 35,366, dated August 22, 1887, and No. 36,582 and No. 3,851, datedFebruary 28, 1888; in England, No. 6,151, dated April 27, 1887, and No.7,377, dated May 3, 1889; in Switzerland, No. 1,505, dated September 20,1889; in Spain No. 10,901, dated August 7, 1890, and in Italy, No. 443,dated August 28, 1888,) of which the following is a specification.

This invention relates to that class of valvegear mechanism forexpansion-engines in which each cylinder is provided with four valves.My valve mechanism permits the cylinder to be filled up to 0.75 of thepistonstroke in lieu of 0.33, as heretofore, which is of specialimportance in expansion-engines having a number of cylinders.

The invention consists in the various features of improvements morefully pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan of my improved valvemechanism; Fig. 2, an end view thereof; Fig. 3, a longitudinal sectionthrough the valve, and Fig.4 atransverse section through the valve.

The four rotary valves are operated by 7 means of the distributin g-diskF, that receives its oscillating motion directly or indirectly by leverC and rod D from the eccentric B, mounted on shaft A. The two lower oroutlet valves are rigidly connected to disk F by means of rods orcranks, while the two upper or inlet valves are operated by thefollowing mechanism: Upon the spindle of each inlet-valve is keyed acrank K, which by means of a weight, spring, or air-piston G is alwaysdrawn down in the direction of the arrow,and when drawn down will holdthe valve closed. The disk F is connected by rodf to one arm of a doublelever H, revolving upon box E, Fig. 3. The other arm of lever H isconnected to a catch I, having a steel nose. The catch is in contactwith a lever L, the pivot of which oscillates at about the center of thevalve-spindle. The crank K, keyed to this spindle, carries likewise asteel nose, which at the proper times is engaged by the nose of catch Ito open the valve. The position of the catch I is controlled by twoindependent motions: First, the catch is oscillated at regular intervalsby lever H and disk F, and, secondly, the steel nose approaches orrecedes by means of the lever L and a rod T.

A system of levers serves to automatically regulate the connection ofthe catch I with the governor of the machine. This system comprises alever N, that receives its motion from eccentric rod D or otherwise. Thelever N is connected to a three-arm regulating-lever Q, which in turn isconnected to the governor by rod S and to the levers L L by rods T T.

The operation of the device is as follows: The eccentric B oscillateslevers H by means of disk F. The lever N, on the other hand, causesoscillation of catch I through lever Q, rods T T, and levers L L. Inconsequence of these two motions acting at different times upon thecatch I the nose on such catch will describe a curve. This curve,according to the inclination of lever Q, (influenced by the governor,)will approach or recede from the center of the valve-spindle, and thusthe nose will glide off the crank K sooner or later to cause a smalleror greater admission of steam.

The form of the valve is shown in Figs. 3 and 4. Theports O O areconnected to the steam-inlet, while the port P is connected to thecylinder. Diametrically opposite to the port P there is a chamber P. Asthe valve rotates in the direction of the arrow openings aresimultaneously produced at a a a a. The steam enters the port P eitherdi rectly through these openings or it enters by means of a channel 6that traverses the valve, or by means of the chamber P. The channel Z),however, extends only through half the length of the valve, Fig. 3,while within the other half the fresh steam from ports 0 O communicatescontinually by means of a horizontal valve-channel c. the rotary valveis not only entirely relieved, but the distance traversed by it producesa quadruple effect. Thus if the valve travels a distance of onecentimeter the openings offered to the steam amount to four centimeters.

What I claim is 1. The combination of disk F and rods f with lever I'I,connected thereto, alever L, pivoted to lever II and having catch I, acrank In this Way a

